9bb8decbcf
Former-commit-id:133dc97f67[formerlya02aeb236c] [formerly9f19e3f712] [formerly06a8b51d6d[formerly9f19e3f712[formerly 64fa9254b946eae7e61bbc3f513b7c3696c4f54f]]] Former-commit-id:06a8b51d6dFormer-commit-id:377dcd10b9[formerly3360eb6c5f] Former-commit-id:8e80217e59
98 lines
2.9 KiB
C#
98 lines
2.9 KiB
C#
/*
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*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*
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*/
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using System;
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using System.Collections;
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using System.Text;
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using System.Threading;
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using Apache.Qpid.Collections;
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using Apache.Qpid.Common;
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namespace Apache.Qpid.Client.Util
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{
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internal delegate void ThresholdMethod(int currentCount);
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/// <summary>
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/// Basic bounded queue used to implement prefetching.
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/// Notice we do the callbacks here asynchronously to
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/// avoid adding more complexity to the channel impl.
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/// </summary>
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internal class FlowControlQueue
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{
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private BlockingQueue _queue = new LinkedBlockingQueue();
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private int _itemCount;
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private int _lowerBound;
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private int _upperBound;
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private ThresholdMethod _underThreshold;
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private ThresholdMethod _overThreshold;
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public FlowControlQueue(
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int lowerBound,
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int upperBound,
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ThresholdMethod underThreshold,
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ThresholdMethod overThreshold
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)
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{
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_lowerBound = lowerBound;
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_upperBound = upperBound;
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_underThreshold = underThreshold;
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_overThreshold = overThreshold;
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}
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public void Enqueue(object item)
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{
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_queue.EnqueueBlocking(item);
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int count = Interlocked.Increment(ref _itemCount);
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if ( _overThreshold != null )
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{
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if ( count == _upperBound )
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{
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_overThreshold.BeginInvoke(
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count, new AsyncCallback(OnAsyncCallEnd),
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_overThreshold
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);
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}
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}
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}
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public object Dequeue()
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{
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object item = _queue.DequeueBlocking();
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int count = Interlocked.Decrement(ref _itemCount);
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if ( _underThreshold != null )
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{
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if ( count == _lowerBound )
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{
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_underThreshold.BeginInvoke(
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count, new AsyncCallback(OnAsyncCallEnd),
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_underThreshold
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);
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}
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}
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return item;
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}
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private void OnAsyncCallEnd(IAsyncResult res)
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{
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ThresholdMethod method = (ThresholdMethod)res.AsyncState;
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method.EndInvoke(res);
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}
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}
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}
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